If philanthropy sounds like a nice, leisurely post-retirement activity to be squeezed in between morning golf and afternoon siesta, the sight of the world’s richest man zipping into and out of cities, countries and continents disabuses you of the notion. With a war chest in excess of $36 billion (approximately Rs 20,200 crore) and a statutory requirement that he must donate five per cent of it each year to remain a charity, William Henry Gates III doles out his millions with the same maniacal zeal that he sold software. His calling card reads ‘Co-Chair, Bill & Melinda Gates Foundation’; his mindset is still of ‘Chairman, Microsoft’.